The tires installed on your vehicle when it was new had a Tire Performance Criteria Specification (TPC Spec)
number on each tire's sidewall. This number ensures
that the tire was built specifically for the vehicle they
were installed on.
When you get new tires, We recommend that you get
tires with that same TPC Spec number.
That way your vehicle will continue to have tires that are designed to give proper endurance, handling, speed rating, load range, traction, ride and other things during normal service on your vehicle.
If your tires have an all-season tread design, the TPC
number will be followed by an MS (for mud and snow).If you ever replace your tires with those not having a TPC Spec number, make sure they are the same size, load range, speed rating and construction type
(bias, bias-belted or radial) as your original tires.
How To Choose The Correct New Tire
Many people like to change the tire size or model because they think they know enough about them to give better performance, tread life or just a better look. But, if you choose the wrong tire type or size you can easily degrade the performance of the your vehicle. After all, the tire is the only thing between your car the road and will have a VERY BIG effect on the way it handles, fuel economy and the general feel and sound of your vehicle.
A small change in tire size can have a big impact on fuel economy.
Some people like the look of bigger tires, especially on truck. But
here is a good example-
A change from a common tire size of 235/65/R16 to 255/65/R16 will
cause a speedometer reading error of 2.5 miles and hour at 60 MPH. The tire with 255 is a taller, larger circumference tire. Your
speedometer will show 70MPH but the actual speed of your vehicle
will be 62.5. This will cause havoc on todays computer controlled
vehicles, not the just the speedometer being off, that is unless your
get the computer reprogrammed to tell it the new tire size.
Not only will a taller tire effect mileage, it will also cause problems
with outer edge wear, especially on trucks. When a vehicle is turning, the normal geometry of the front suspension causes the tire to tip a little. The top will tip outward or inward and the bottom will do the opposite depending on the direction of the turn. This will cause more wear than if the tire size was the original that the vehicle was
designed with. There is a sticker on the inside of the drivers door that shows what the car was built with.
Proper tire pressure is also a very important. Changing tires
pressure can also effect the handling of your car as well as the life of
the tire. Suspension problem can occur with pressure that is too high
or too low. See this link for examples of tire problem caused by
under or over inflation.